Aluminium alloy



Patented May 3, 1938 UNITED STATES ALLOY Yonosuke Matuenaga, Naka-ku, Yokohama,

Japan No Drawing. Application November 12, 1936, Se-

rial No. 110,552.

1 Claim,

This application is a continuation-in-part of applicant's copending application Serial No. 78,721 filed May 8, 1936.

This invention relates to an aluminium alloy comprising main and auxiliary elements, the main element consisting of 2 to 5% magnesium, 6 to 14% zinc, 0.3 to 2% copper, 0.01 to 0.5% iron, 0.1 to 1.0% silicon and the restsubstalntiaily aluminium keeping the condition that the content of silicon is always greater than that of iron, while the auxiliary element consisting of a. metal selected from the group of 0.1 to 1.0% manganese, 0.1 to 5% cobalt, 0.1 to 5% molybdenum, and

0.1 to 1.5% lithium. The new alloy may also contain a small quantity of vanadium, beryllium and tungsten in place of a part of aluminium The object of the invention is to obtain anew aluminium alloy which has both a great tensile strength and a great elongation especially when 20. subjected under heat treatment.

Examples of the alloy'showing percentages of the elements employed and also tensile strength and elongation when the alloys are subjected under a mode of tempering and annealing are given as follows:

Example 1 Mg 2. 5 2. 5 Zn 9. 0 9.0 Cu 0.5 1. 0 Fe 0.2 0.2 Si 0. 6 0.6 Mn 1 0. 8 0.8 A1 Rest Rest Tensile strength kgJcm. 60 63 Elongation 15 17 Example 2 M 3.0 3.0 21; 7.0 7.0 Cu 1. 2 1. 2 Fe 0.3 -0. 3 '.S1 0.8 0.8 CO h 0 2 Al--. Rest Rest Tensile strength kg./cm'.= 57 59 Elongation 11 9 w Example 3 Mg 3. Zn 8. Cu- 1.

rr' Fe o- Si 0. -Mo V 3.

A1 Rest Tensile strength k'g.'/cm.=. 56

I 5 Elongation 10 Tensile strength kg./cm. 57

QUINQQO In Japan May 13, 1935 Example 4 Zn Cu Fe Si -1 Li A1 Elongation i '10 10 The alloymay also contain two or more of the auxiliary metals.

. Example 5 4 Mg 2.5 2.5 2.5 15 Zn 9.0 .9.0 9.0 Cu 1. 0 1.0 1. 0 Fe; 0.2 0.2 0.2 Si s 0.6 0. 6. 0.6 Go 0. 5. 1. 0" 2. 0 Mn 0. 8 0. 8 0. 8 A1 Rest Rest Rest Tensile strength kg./cm.= 61. 2 63.6 60. 8 Elongation 1.6. 6 11. 6 10 .0

7 Example 6 25' Mg 2. 5 2. 5 2. 5 Zn 9. 0 9. 0 9. 0 Cu 1. 0 1. 0 '1. 0 Fe 0. 2 0. 2 0. 2 s1 0. 6 0. 6" 0.6 30 Mo 0. 5 1.0 2.0 Mn 0. 8 0. 8 0. 8 Al.. Rest Rest Rest Tensile strength kg./cm'.= 58; 7 60.3 54. 1 Elongation 20.0 12.0 12.6 35

. Example 7 Mg 2.5 2.5 2.5 2.5 2.5 -Zn 9.0 9.0 9.0 9. 0' 9.0 Cu 1.0 1.0 1.0 1.0 1.0 40 Fe 0.2 0.2 0.2 0.2 0.2 Si 0. 6 0. 6 0. 6 0; 6 0. 6 Li 0.1 0.2 0.4 0.6 1.0 Mn 0. 8 0. 8 0. 8 0. 8 0. 8

Al Rest Rest Best Best Best 45 Tensile strength 1:g./cm. 62.5 62.9 65.2 65. v8 1' 67.0 Elongation 95... 18.5 14.0 12.4 8.0 8.0

. Example8 2.5 60

Zn 8.0 Cu 1.0

Si 7 I 0.8

Co 1.5 M0 1.5 A1 Rest Tensile. strength kgJcin 56 Elongation 11 0o Example 9 M1 2.5 Zn 9.0 Cu 1.0 F 0.3 $1 0.8

Go 2.0 Li 0.7

A1 Rest Tensile strength kg./cm -4 58 Elongation 10 Example 10 e 3.0 Zn 9.0

Cu 0.8 Fe 0.2 81 0.6 Mo 2.5 LL 1.0

AL-.." I Rest Tensile strength kg./cm 57 Elongation 11 As to be seen from the above examples, the new alloya'ccording to the invention has a very great tensile strength and a very great elongation which are hardly obtained in known aluminium alloys.

As to mutual actions or the elements for the new alloy, it is supposed as follows. A part 01 only act as reducing agents, but also hinders the growth 01' particles oi zinc-manganese-aluminium alloys and also of copper-iron alloy so that the distribution of the alloys may be promoted.

Also it is deemed that the smaller percentage of iron gives a greater strength and elongation and this fact is supposed that iron may be detrimental to the natures, and this drawback is eliminated by using silicon or silicon and manganese in a greater percentage.

What I claim is:-

An aluminium alloy containing 2 to 5% ma I neslum, 6 to 14% zinc, .3 to 2% copper, .01 to 5% iron, .1 to 1% silicon, the silicon content being always greaterthan the iron content, .1 to 1% manganese and the rest aluminium.

YONOSUKE MATUENAGA. 

